Regardless of LOS rules, you may not target an empty space with a blast attack. It must have a target model.

Other than that LOS could be drawn to that square as the hero can clearly see the cirner closest to him. Its the same readon a melee atrack could target a diagonally adjacent monster even if a hero is surrounded.

Okay thank you, we flubbed a bit with the targeting rules, let the heroes do it in the end because the consol was winning. But for future reference in that same instance you can target diagonally through enemies (with ranged attacks)? We were only confused because you are not allowed to move diagonally through enemies placed as such.

I'm working off memory here, not looking at the rules. I could be wrong (except about the targeting an empty space, i know you can't do that). When I get a chance, I'll look at the preview rule PDF again and see if I can more accurately confirm the ruling.

Okay thank you, we flubbed a bit with the targeting rules, let the heroes do it in the end because the consol was winning. But for future reference in that same instance you can target diagonally through enemies (with ranged attacks)? We were only confused because you are not allowed to move diagonally through enemies placed as such.

You can't target through enemies if the hero doesn't have line of sight. Models with large base can see above small base enemies, and models with fly can see (and be seen by) any model (except behind walls).Hope it clarifies.